JP2013016878A - Receiver and reception method - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a receiver in which calibration is eliminated in the stage of process adjustment, and broadcast can be received without losing the sound period of a broadcast content in a state always adjusted to the optimum reception characteristics, even when the ambient temperature changes while selecting the same broadcasting station after turning power on, and to provide a reception method.SOLUTION: A silent detection circuit 9 detects the silent period of a transmitted broadcast content, and outputs a silent detection signal 9a. A calibration signal generation circuit 4 outputs a calibration signal 4a for detecting the deviation amount between the I path and the Q path of an orthogonal demodulation circuit 5 by using the silent detection signal 9a as a trigger. An IQ deviation detection circuit 11 performs comparison with a reference value when there is no deviation in the IQ path, and outputs the amplitude deviation 11a and the phase deviation 11b of the IQ path. A correction arithmetic circuit 10 generates an amplitude correction signal 10a and a phase correction signal 10b for adjusting the amplitude and phase in the orthogonal demodulation circuit 5.

Description

  The present invention relates to a receiving apparatus and a receiving method in a radio system, and more particularly to a technique for correcting an amplitude and phase mismatch between an in-phase (I) component and a quadrature (Q) component in quadrature demodulation.

  In the conventional receiving apparatus, it is possible to correct the amplitude and phase mismatch between the I component and the Q component in quadrature demodulation. For this reason, the mode is changed from a reception mode in which an RF signal is received and converted into a baseband signal to a calibration mode in which a calibration signal is input by switching a switch (see Patent Document 1).

JP 2007-104522 A

  In the above conventional receiving apparatus, it is necessary to switch the switch to enter the calibration mode in order to input the calibration signal, and during this period, it is impossible to receive the actual broadcast wave. For this reason, actual calibration is limited to the stage of process adjustment, immediately after power-on, or when the user changes the receiving station. When adjustment is necessary, switching to the calibration mode has a problem that the sound period to be broadcast disappears in analog radio broadcasting.

  The present invention solves the above-mentioned conventional problems, and calibration at the stage of process adjustment is unnecessary, the same broadcasting station is selected after turning on the power, and a change in ambient temperature occurs However, it is an object of the present invention to provide a receiving apparatus and a receiving method that enable broadcast reception without losing the sound period of the broadcast content in a state that is always adjusted to optimum reception characteristics.

  In order to solve the above problems, a receiving apparatus according to the present invention has a signal from a receiving antenna as an input, a high-frequency amplification unit that outputs the high-frequency signal, an output of the high-frequency amplification unit as one input, and the other Selecting means for selecting and outputting one of the inputs, orthogonal demodulating means for inputting the output of the selecting means and converting it into an I component and a Q component by a mixer, and demodulation of the orthogonal demodulating means Analog-to-digital conversion means for converting each of the I signal and the demodulated Q signal from an analog signal to a digital signal; baseband demodulation means for demodulating an audio signal by using each digital output of the analog-to-digital conversion means; and Detecting a silence period of the output signal of the baseband demodulating means, and outputting to the selection means, and according to the output of the silence detecting means, The calibration signal generating means for generating a calibration signal as the other input to the selection means, and the digital outputs of the analog-digital conversion means are input, and the amplitude and phase between the digital I signal and the digital Q signal are input. An IQ deviation detecting means for detecting a deviation and an output of the IQ deviation detecting means are input, and amplitude and phase deviation correction amounts between the I signal path and the Q signal path are calculated and output to the quadrature demodulating means. And a correction calculation means.

  A receiving method according to the present invention is a receiving method for demodulating an audio signal after performing an orthogonal demodulation step of converting a high-frequency signal input from a receiving antenna into an I component and a Q component. A silent period is detected, and amplitude and phase deviation correction amounts are calculated using a calibration signal during the silent period and output to the orthogonal demodulation step.

  According to the present invention, by adopting silence detection, the correction between the I signal path and the Q signal path is corrected using the calibration signal during the silence period, so that calibration at the stage of the process adjustment becomes unnecessary. Even when the same broadcasting station is still selected after being turned on, there is an effect that reception is always possible in a state adjusted to optimum reception characteristics.

It is a block block diagram of the receiver in Embodiment 1 of this invention. 2 is a timing chart showing the timing of silence detection and calibration in the receiving apparatus of FIG. 1. It is a block block diagram of the receiver in Embodiment 2 of this invention. It is a timing chart which shows the reception condition in the receiver of FIG. It is a block block diagram of the receiver in Embodiment 3 of this invention. 6 is a timing chart showing a control process of a calibration period in the receiving apparatus of FIG. It is a timing chart which shows the example of the adjustment sequence in Embodiment 4 of this invention. It is a block block diagram of the receiver in Embodiment 5 of this invention. 9 is a timing chart showing a control relationship of a time passage determination circuit in the receiving apparatus of FIG. It is a block block diagram of the receiver in Embodiment 6 of this invention. 11 is a timing chart showing a control relationship of a temperature change determination circuit in the receiving apparatus of FIG. 10. It is a flowchart which shows the reception method in Embodiment 7 of this invention. It is a flowchart which shows the reception method in Embodiment 8 of this invention. It is a flowchart which shows the reception method in Embodiment 9 of this invention. It is a flowchart which shows the receiving method in Embodiment 10 of this invention. It is a flowchart which shows the receiving method in Embodiment 11 of this invention. It is a flowchart which shows the receiving method in Embodiment 12 of this invention.

  Hereinafter, embodiments of the present invention will be described with reference to the drawings. In each embodiment, the description of the same or similar parts will not be repeated in principle unless particularly necessary.

Embodiment 1
FIG. 1 is a block configuration diagram of a receiving apparatus according to Embodiment 1 of the present invention. In FIG. 1, 1 is a receiving antenna that receives a broadcast wave 1a, 2 is a high-frequency amplifier circuit that amplifies a signal from the receiving antenna 1 and outputs a high-frequency amplified signal 2a, and 4 is quadrature demodulated using a silence detection signal 9a as a trigger. A calibration signal generating circuit 3 for generating a calibration signal 4a for adjusting variations in amplitude and phase of the IQ signal path of the circuit 5, 3 is either one of the high frequency amplified signal 2a or the calibration signal 4a according to the silence detection signal 9a. And a selection circuit 5 for outputting a selection output signal 3a, a quadrature demodulation circuit for performing quadrature demodulation with the selection output signal 3a as an input and outputting an in-phase component I signal 5a and a quadrature component Q signal 5b; An A / D conversion circuit (ADC) that converts the in-phase component I signal 5a and the quadrature component Q signal 5b from analog to digital and outputs digital I data 6a and digital Q data 7a. 8 is a baseband demodulating circuit that receives the digital I data 6a and the digital Q data 7a, performs audio demodulation according to the reception mode of the system, and outputs a reproduction L signal 8a and a reproduction R signal 8b; A silence detection circuit that receives the signal 8a and the reproduction R signal 8b, detects a silence period, and outputs a silence detection signal 9a, 11 is the output of the A / D conversion circuits 6 and 7, and the digital I data 6a The IQ deviation detection circuit 10 receives the digital Q data 7a, detects the amplitude and phase deviation between the I component and the Q component, and outputs the amplitude deviation 11a and the phase deviation 11b. Calculation for correcting the amplitude and phase is performed so as to reduce the amplitude and phase deviation generated in the quadrature demodulation circuit 5 from the amplitude deviation 11a and the phase deviation 11b that are output more, thereby correcting the amplitude. No. 10a and a correction operation circuit for outputting a phase correction signal 10b.

  FIG. 2 is a timing chart showing silence detection and calibration timing. According to the present embodiment, in the normal reception mode, the high frequency amplified signal 2 a obtained by amplifying the broadcast wave 1 a by the high frequency amplifier circuit 2 is input to the quadrature demodulation circuit 5 via the selection circuit 3. In the quadrature demodulation circuit 5, the high frequency amplified signal 2 a is converted into an in-phase component I signal 5 a and a quadrature component Q signal 5 b, converted into digital data by the A / D conversion circuits 6 and 7, and received in the reception mode by the baseband demodulation circuit 8. The reproduction signals 8a and 8b corresponding to the above are output.

  The silence detection circuit 9 detects the silence period of the broadcast content to be transmitted. If the silence period continues for a system set value or more, it is determined that the silence period has started, and the silence detection signal 9a is output. Here, “silence” means a state in which only a carrier wave of a broadcast is detected, not a state in which only an audio signal below a certain threshold level is detected. However, the determination condition as silence in this case and the time from the determination to the generation of the silence detection signal 9a can be set by the operated system.

  The calibration signal generation circuit 4 outputs a calibration signal 4a for detecting a deviation between the I path and the Q path of the quadrature demodulation circuit 5 using the silence detection signal 9a as a trigger. When the selection circuit 3 receives the silence detection signal 9a, the selection output is switched from the high frequency amplified signal 2a to the calibration signal 4a and input to the orthogonal demodulation circuit 5. In the quadrature demodulation circuit 5, analog signals that have passed through the I path and Q path are converted into digital I data 6a and digital Q data 7a by A / D conversion circuits 6 and 7, respectively. The IQ deviation detection circuit 11 compares with the reference value when there is no deviation in the IQ path, outputs the IQ path amplitude deviation 11a and the phase deviation 11b, and the correction arithmetic circuit 10 causes the amplitude and phase in the quadrature demodulation circuit 5 to be output. An amplitude correction signal 10a and a phase correction signal 10b are generated for performing the adjustment. The quadrature demodulation circuit 5 corrects the deviation by adjusting the amplitude of the IQ path and the phase of the quadrature mixer in accordance with the amplitude correction signal 10a and the phase correction signal 10b.

  Since the calibration signal 4a is demodulated in the baseband demodulating unit 8, the above-described calibration is performed with the audio output muted on the final output unit.

  As described above, according to the present embodiment, since the silence period is detected and the amplitude adjustment and the phase adjustment of the IQ path are performed, calibration at the stage of the process adjustment becomes unnecessary, and the same broadcasting station is turned on after the power is turned on. Even in a state in which is selected, reception is always possible in a state adjusted to optimum reception characteristics.

<< Embodiment 2 >>
FIG. 3 is a block diagram of the receiving apparatus according to the second embodiment of the present invention. The configuration of the receiving apparatus in FIG. 3 is the same as that of the first embodiment except that a reception status signal 8c indicating whether the received electric field is strong or multipath is present is added as an output of the baseband demodulation circuit 8. The function is the same.

  FIG. 4 is an example of a timing chart showing the reception status. When the amplitude of the reproduced signals 8a and 8b is extremely lowered to the silence level due to the influence of multipath after changing from silence to sound, only the amplitude is shown. Even if it is determined as a silence period when detected at, the reception status signal 8c is input to the silence detection circuit 9, so that it can be determined that there is no sound, and there is no misjudgment. In addition to the normal reception electric field, reception is possible in a state in which the reception characteristic is always adjusted to the optimum reception characteristic even in a weak electric field situation or a multipath situation.

<< Embodiment 3 >>
FIG. 5 is a block diagram of the receiving apparatus according to the third embodiment of the present invention. The configuration of the receiving apparatus in FIG. 5 is the same as that of the second embodiment in that a voiced disappearance detection circuit 12 is newly provided, and when the silent period ends and the voiced period disappears during the calibration period, the calibration period The control signal 12a is output to the calibration signal generation circuit 4 to perform control so as to shorten the next calibration period, and other configurations and functions of the respective blocks are the same.

  FIG. 6 is a timing chart showing the control process of the calibration period. In FIG. 6, the calibration signal 4a for correcting the deviation of the IQ path by the first silence detection signal 9a is input to the quadrature demodulation circuit 5, the deviation is detected by the IQ deviation detection circuit 11, and the orthogonality is obtained by the correction arithmetic circuit 10. The deviation in the demodulation circuit 5 is corrected.

  The voiced disappearance detection circuit 12 detects the amplitude of the reproduction L signal 8a and the reproduction R signal 8b, which are the outputs of the baseband demodulation circuit 8 immediately after the calibration is completed and the calibration period signal 4b changes from the H level to the L level. Then, it is determined whether the sound is sound or not. In the case of FIG. 6, the result of amplitude detection immediately after is determined to be sound, the calibration period control signal 12a is output, and the disappearance of the sound period is prevented by shortening the calibration period length in the second silent period. It shows how it is.

  By shortening the calibration time in this way, it is possible to reduce the frequency of disappearance of the sound period actually broadcast.

<< Embodiment 4 >>
FIG. 7 is a timing chart showing an example of an adjustment sequence according to the fourth embodiment of the present invention. The block diagram of the receiving apparatus is the same as that of the third embodiment, but the period of the calibration signal 4a generated by the calibration signal generating circuit 4 is set short, and the I signal path and the Q signal are set over a plurality of silent periods. The calibration signal generation circuit 4, the IQ deviation detection circuit 11, and the correction calculation circuit 10 are controlled so that an adjustment sequence that completes the deviation adjustment of the amplitude and phase between the paths is completed.

  FIG. 7 shows an example of a sequence in which the amplitude is adjusted in two silent periods and the phase is adjusted in the subsequent two silent periods. Since it is assumed that the calibration is performed over a plurality of silent periods, the period of the calibration signal 4a in FIG. 7 is sufficiently shorter than the normal silent period. The amplitudes of the reproduction L signal 8a and the reproduction R signal 8b, which are the outputs of the baseband demodulation circuit 8 immediately after the change from the H level to the L level, remain silent.

  It should be noted that the number of times of silence over a plurality of times and the adjustment contents thereof are examples, and the number of silences and the order of adjustment according to each system may be used.

  By making such an adjustment sequence, the calibration period is shortened and the calibration is completed over a plurality of silent periods. Therefore, the silent period continues even when the calibration signal 4a is input in each period. There is almost no loss of the broadcast sound period.

<< Embodiment 5 >>
FIG. 8 is a block diagram of a receiving apparatus according to the fifth embodiment of the present invention. The configuration of the receiving device in FIG. 8 is a configuration in which a time passage determination circuit 13 for controlling the silence detection signal 9a is newly provided in the third embodiment, and the other configurations and the configurations of the respective blocks are the same.

  FIG. 9 is a timing chart showing the relationship of control of the time passage determination circuit 13 with respect to the silence detection signal 9a. Immediately after the power is turned on, every time a silence period is detected (t0, t1, t2, t3), the silence detection signal 9a is directly input to the selection circuit 3 and the calibration signal generation circuit 4 as the time lapse determination signal 13a, and the calibration signal The amplitude and phase deviation adjustment between the I signal path and the Q signal path of the quadrature demodulation circuit 5 is performed by 4a.

  Furthermore, when sufficient time has elapsed since the power was turned on and the system set time (t3 in FIG. 9) has been exceeded, sufficient deviation adjustment has been performed, so even if the silence detection signal 9a is output, It is not necessary to adjust the deviation every time. As shown in FIG. 9, the deviation adjustment is not performed at the timings t4, t5, and t10, and the deviation adjustment is performed at the timings t6 and t17. It becomes possible to further reduce the disappearance frequency.

  It should be noted that the system setting value and the frequency of adjustment over time can be set for each applied system.

Embodiment 6
FIG. 10 is a block diagram of a receiving apparatus according to the sixth embodiment of the present invention. The configuration of the receiving apparatus in FIG. 10 is a configuration in which a temperature change determination circuit 14 for controlling the silence detection signal 9a is newly provided in the third embodiment, and the other configurations and the configurations of the respective blocks are the same.

  FIG. 11 is a timing chart showing the relationship of control of the temperature change determination circuit 14 with respect to the silence detection signal 9a. When the ambient temperature is constant (t0 to t5 and t14 to t20 in FIG. 11), the silence detection signal 9a is used as the temperature change determination signal 14a, and the selection circuit 3 and the calibration signal generation circuit are set at a certain frequency set as a system. 4, and the deviation of the amplitude and phase between the I signal path and the Q signal path of the orthogonal demodulation circuit 5 is adjusted by the calibration signal 4 a.

  On the other hand, when a change in the ambient temperature occurs (t8 to t13 in FIG. 11), since the variation in the circuit has a temperature characteristic, the reception characteristic becomes insufficient with the adjustment frequency so far. By reflecting the silence detection signal 9a to the selection circuit 3 and the calibration signal generation circuit 4 so that the adjustment is performed at a frequency higher than the fixed frequency set in step 1, the deviation can be sufficiently adjusted. . Therefore, even if the ambient temperature changes after a sufficient amount of time has elapsed since the system power was turned on, deviation adjustment can be performed whenever a temperature change occurs. It becomes possible to receive in the state that has been done.

  It should be noted that a certain frequency set as a system, a temperature change amount, and the like can be set for each applied system.

<< Embodiment 7 >>
FIG. 12 is a flowchart illustrating an example of a control operation in the reception method according to the seventh embodiment of the present invention. In FIG. 12, when the system is turned on and the system starts receiving, the received signal is quadrature demodulated and converted into an in-phase (I) component and a quadrature (Q) component. Performed (S121).

  At this time, in order to check whether or not the demodulated sound signal is silent, the signal amplitudes of the I component and the Q component are detected and compared with a set value to determine whether sound is present or not (S122). ). If there is sound, the state of the reception mode is continuously maintained. If it is determined that there is no sound, a calibration signal is generated from S123 to S127, and the amplitude between the I component and the Q component in the orthogonal demodulation circuit and Correct the phase deviation. Here, a calibration signal period T is set in S123, a calibration signal is generated in S124, a deviation correction amount is calculated in S125, the amplitude and phase of the quadrature demodulation circuit are adjusted in S126, and a calibration end check is performed in S127. Execute.

  By repeating S123 to S127, it becomes possible to make the I component and the Q component have no deviation, and even when the same broadcasting station is still selected, it is always adjusted to the optimum reception characteristics. It becomes possible to receive.

Embodiment 8
FIG. 13 is a flowchart illustrating a control operation example in the reception method according to the eighth embodiment of the present invention. In FIG. 13, the same control operation as in the seventh embodiment is performed except for S132.

  In order to check whether the demodulated audio signal is silent, the signal amplitude of the I component and the Q component is detected, and when comparing the magnitude with the set value, the information about the reception status other than the amplitude information is taken into account. (S132), it is possible to prevent erroneous silence determination, and reception is performed in a state in which the reception characteristic is always adjusted to the optimum reception characteristic not only in a normal reception electric field but also in a weak electric field situation or a multipath situation. It becomes possible.

Embodiment 9
FIG. 14 is a flowchart illustrating an example of a control operation in the reception method according to the ninth embodiment of the present invention. In FIG. 14, the same control operation as in the eighth embodiment is performed except for S141 and S142.

  Immediately after the silence period is detected (S132), a calibration signal is generated in S123 to S127, and the correction of the amplitude and phase deviation between the I component and the Q component in the quadrature demodulation circuit is completed. Then, the demodulated sound is judged to be voiced or silent. At this time, if there is no sound, it is considered that calibration is completed normally. On the other hand, if there is sound, it is determined that the silent period has ended during the calibration period, and the length of the calibration signal period T is updated in S142 to shorten the period T of the next calibration signal (T = T-α).

  By shortening the calibration time in this way, it is possible to reduce the frequency of disappearance of the sound period actually broadcast.

<< Embodiment 10 >>
FIG. 15 is a flowchart illustrating a control operation example in the reception method according to the tenth embodiment of the present invention. In FIG. 15, the same control operation as in the seventh embodiment is performed except for S151, S152, S153, S154, and S155.

  First, when the silent period of the demodulated audio signal is detected (S122), the number of calibrations N is counted (S151), and the calibration signal period T set by the system is set. Then, calibration signals are generated from S124 to S126 and S153, and the amplitude and phase deviations between the I component and the Q component in the quadrature demodulation circuit are corrected.

  It is determined whether the calibration in one silence period has been completed (S153). If it has been completed, it is determined whether the number of calibrations N matches the number set in the system (S154). Continue calibration. If they match, it is considered that the calibration has been completed, the number N of calibrations is reset (S155), and the flow returns to the normal reception operation (S121) flow.

  By performing such operation control, the calibration period is shortened and the calibration is completed over a plurality of silent periods, so the silent period continues even when the calibration signal is input in each period, It is possible to significantly reduce the frequency of disappearance of the broadcast sound period.

<< Embodiment 11 >>
FIG. 16 is a flowchart illustrating an example of a control operation in the reception method according to the eleventh embodiment of the present invention. In FIG. 16, the same control operation as in the seventh embodiment is performed except for S161, S162, S163, and S164.

  When the silence period of the demodulated audio signal is detected (S122), the number of silence detections M is counted (S161). In S162, the time elapsed immediately after the power is turned on is measured and compared with the set time set in the system. If the time is shorter than the set time (when the time has not passed since the power was turned on), the process starts from S123. In S127, a calibration signal is generated, and the amplitude and phase deviation between the I component and the Q component in the quadrature demodulation circuit is corrected. When the calibration is completed, the silence detection count M is reset (S164), and the flow returns to the normal reception operation (S121) flow.

  If the elapsed time immediately after the power is turned on in S162 is longer than the set time (when the time has passed sufficiently since the power is turned on), the silence detection count M matches the number set by the system. If the silent detection detection count M is equal to or greater than the set number, calibration is executed. If the number is less than the set number, the normal reception operation (S121) flow is performed without performing calibration even during the silent period. Return.

  By performing such operation control, it is assumed that the ambient temperature of the system operating environment is sufficiently constant when sufficient time has elapsed since the system power was turned on. It is not necessary to correspond to each result, and the execution frequency of calibration can be lowered, and the frequency of disappearance of the broadcast sound period can be further reduced.

<< Embodiment 12 >>
FIG. 17 is a flowchart illustrating a control operation example in the reception method according to the twelfth embodiment of the present invention. In FIG. 17, control operations similar to those in the seventh embodiment are performed except for S171, S172, S173, and S174.

  When the silence period of the demodulated audio signal is detected (S122), the number of silence detections M is counted (S171). In S172, the ambient temperature change immediately after the power is turned on is measured, and the detected temperature change amount is compared with the temperature change amount set in the system. When the temperature change amount is larger than the set value, A calibration signal is generated from S123 to S127, and the deviation of the amplitude and phase between the I component and Q component in the quadrature demodulation circuit is corrected. When the calibration is completed, the silence detection count M is reset (S174), and the flow returns to the normal reception operation (S121) flow.

  When the temperature change amount is smaller than the set value in S172, it is determined whether the silence detection count M matches the system set count (S173), and the silence detection detection count M exceeds the set count. Performs calibration, but if the number is less than the set number of times, the flow returns to the normal reception operation (S121) flow without performing calibration even in the silent period.

  By performing this kind of operation control, calibration can be performed every time a temperature change occurs even if the ambient temperature changes after sufficient time has elapsed since the system power was turned on. Therefore, reception is always possible with the optimum reception characteristics adjusted.

  As described above, the receiving apparatus and the receiving method of the present invention are useful as techniques for adjusting demodulation characteristics caused by element variations of the receiving apparatus in a wireless system.

DESCRIPTION OF SYMBOLS 1 Reception antenna 2 High frequency amplifier circuit 3 Selection circuit 4 Calibration signal generation circuit 5 Orthogonal demodulation circuit 6,7 Analog-digital (A / D) conversion circuit 8 Baseband demodulation circuit 9 Silence detection circuit 10 Correction calculation circuit 11 IQ deviation detection circuit 12 Voice disappearance detection circuit 13 Time lapse determination circuit 14 Temperature change determination circuit

Claims (12)

High-frequency amplification means for receiving a signal from the receiving antenna and outputting the high-frequency signal;
The selection means for selecting one of the inputs from the output of the high-frequency amplification means and selecting and outputting the other input;
Orthogonal demodulation means for inputting the output of the selection means and converting it into an I component and a Q component by a mixer;
Analog-to-digital conversion means for converting the demodulated I signal and demodulated Q signal of the orthogonal demodulating means from analog signals to digital signals, respectively;
Baseband demodulation means for demodulating an audio signal with each digital output of the analog-digital conversion means as input,
A silence detecting means for detecting a silence period of the output signal of the baseband demodulating means and outputting to the selecting means;
Calibration signal generating means for generating a calibration signal as the other input to the selection means according to the output of the silence detection means,
IQ deviation detection means for detecting deviations in amplitude and phase between the digital I signal and the digital Q signal, each digital output of the analog-digital conversion means as an input;
A correction calculating means for calculating the amplitude and phase deviation correction amounts between the I signal path and the Q signal path and outputting to the quadrature demodulating means with the output of the IQ deviation detecting means as an input; A receiving device. The receiving device according to claim 1,
A silencer is characterized in that the silence detection means performs silence determination together with information on reception status of reception electric field strength / multipath occurrence / non-occurrence. The receiving apparatus according to claim 1 or 2,
Input calibration end timing signal at the calibration signal generating means, and output a calibration period control signal to shorten the calibration time at the calibration signal generating means if the demodulated signal immediately after the end of calibration is already sounded A receiving apparatus, further comprising sound loss disappearance detecting means. The receiving apparatus according to claim 1 or 2,
The silence detecting means and the calibration signal generating means are arranged so as to complete an adjustment sequence in which amplitude and phase deviation adjustment between the I signal path and the Q signal path is completed over a plurality of silence periods. A receiving device that controls the receiving device. In the receiving device according to any one of claims 1 to 4,
The time elapses immediately after the system power is turned on, and immediately after the power is turned on, every time silence is detected by the silence detection means, the I signal path and the Q signal path are determined by the calibration signal from the calibration signal generation means. The amplitude and phase between the I signal path and the Q signal path when the elapsed time after turning on the power reaches a reference time set by the system or more is adjusted. A receiving apparatus, further comprising time lapse determination means for performing execution control of the deviation adjustment. The receiving apparatus according to any one of claims 1 to 5,
A change in ambient temperature is detected immediately after the system power is turned on, and when a change in ambient temperature is detected and silence is detected by the silence detection means, the I signal path and the A receiving apparatus, further comprising temperature change determination means for adjusting an amplitude and phase deviation between the Q signal path and the Q signal path. A reception method for demodulating an audio signal after performing an orthogonal demodulation step of converting a high-frequency signal input from a receiving antenna into an I component and a Q component,
A receiving method, comprising: detecting a silent period in the audio signal, calculating a correction amount of each amplitude and phase deviation using a calibration signal during the silent period, and outputting the correction amount to the orthogonal demodulation step. The receiving method according to claim 7, wherein
A reception method comprising: performing silence determination together with information on reception status of reception electric field strength / multipath occurrence presence / absence in detection of the silence period. The reception method according to claim 7 or 8,
If the demodulated audio signal is already voiced immediately after the calibration is completed using the calibration signal, the reception method is characterized by shortening the period of the calibration signal. The reception method according to claim 7 or 8,
The number of silence periods and the period of the calibration signal so as to complete an adjustment sequence that completes deviation adjustment of the amplitude and phase between the I component and the Q component over a plurality of silence periods. A receiving method characterized by controlling the above. The reception method according to any one of claims 7 to 10, wherein:
Measure the passage of time, adjust the amplitude and phase deviation between the I component and the Q component with a calibration signal for each silent period immediately after turning on the power. A receiving method, wherein execution control of amplitude and phase deviation adjustment between the I component and the Q component is performed when a set reference time or more is reached. The reception method according to any one of claims 7 to 11,
An ambient temperature is detected, a temperature change is detected, and an amplitude and phase deviation adjustment between the I component and the Q component is performed by the calibration signal when there is a silent period. Reception method.

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